Oil pump - dismantling, inspection and reassembly

Dismantling
1 The oil pump can be dismantled for
cleaning, but if any of the components are
worn, the pump must be renewed as an
assembly.

2 To dismantle the pump, proceed as follows.

3 Unscrew the two securing bolts, and
remove the pump cover (see illustration).

27.3 Removing the oil pump cover

4 Lift the inner and outer rotors from the
pump casing.

5 Unscrew the pressure relief valve plug from
the pump cover, recover the washer, and
withdraw the spring and plunger (see
illustrations).

27.5a Unscrew the pressure relief valve plug and washer . . .

27.5b . . . and withdraw the spring and plunger

Inspection
6 Thoroughly clean all components in petrol or
paraffin, and wipe dry using a non-fluffy rag.

7 Examine the rotors and the pump casing for
signs of excessive wear on the machined
surfaces. If wear is evident, the complete
pump assembly must be renewed, as spare
parts are not available individually.

Reassembly
8 Commence reassembly by lubricating the
relief valve plunger. Fit the plunger and the
spring, and screw the plug into place,
ensuring that the washer is in place under the
plug.

9 Lubricate the rotors, and fit them to the
pump casing with the punch marks facing the
pump cover (see illustration).

27.9 The punch marks (arrowed) on the oil pump rotors must face the pump
cover

10 Refit the pump cover and tighten the
securing bolts.

11 Prime the pump before refitting.

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